﻿using System;
using System.ComponentModel.Composition;
using System.Xml.Linq;
using DocumentFormat.OpenXml.Packaging;

namespace Songhay.OpenXml.Transformations
{
    using Songhay.Extensions;
    using Songhay.OpenXml;
    using Songhay.OpenXml.Extensions;
    using Songhay.OpenXml.Models;

    /// <summary>
    /// Transforms the Open XML WordML <c>sdt</c> element.
    /// </summary>
    [Export(typeof(IWordProcessingDocumentTransformation))]
    public class ContentControlForAcronymTransformation : IWordProcessingDocumentTransformation
    {
        /// <summary>
        /// Initializes a new instance of the <see cref="ContentControlForAcronymTransformation"/> class.
        /// </summary>
        public ContentControlForAcronymTransformation()
        {
            this.ExecutionOrdinal = 1;
        }

        #region IWordProcessingDocumentTransformation Members

        /// <summary>
        /// Gets or sets the execution ordinal.
        /// </summary>
        /// <value>The execution ordinal.</value>
        public byte ExecutionOrdinal { get; set; }

        /// <summary>
        /// Determines whether this instance can transform the specified word doc.
        /// </summary>
        /// <param name="wordDoc">The Word document.</param>
        /// <param name="settings">The settings.</param>
        /// <param name="node">The node.</param>
        /// <returns>
        /// 	<c>true</c> if this instance can transform the specified word doc; otherwise, <c>false</c>.
        /// </returns>
        public bool CanTransform(WordprocessingDocument wordDoc,
            SonghayHtmlConverterSettings settings, XNode node)
        {
            var element = node.GetElement(SonghayW.sdt);
            if(element == null) return false;
            return element.HasSdtTagName("rxAcronym");
        }

        /// <summary>
        /// Transforms the specified Word document.
        /// </summary>
        /// <param name="wordDoc">The Word document.</param>
        /// <param name="settings">The settings.</param>
        /// <param name="node">The node.</param>
        /// <param name="imageHandler">The image handler.</param>
        public object Transform(WordprocessingDocument wordDoc,
            SonghayHtmlConverterSettings settings, XNode node,
            Func<ImageInfo, XElement> imageHandler)
        {
            var sdt = node.GetElement(SonghayW.sdt);
            var acronymText = sdt.GetSdtDisplayValue();
            var acronymTitle = sdt.GetSdtPropertyValue(SonghayW.alias);

            var acronym = new XElement(SonghayXhtml.acronym,
                new XAttribute(SonghayXhtml.title_attr, acronymTitle),
                acronymText
            );

            return acronym;

        }

        #endregion
    }
}
